Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6

[pandora-kernel.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index 71b161b..0e18b4d 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2680,10 +2680,12 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
        delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
 
        /*
-        * Make sure try_to_free_swap didn't release the swapcache
-        * from under us. The page pin isn't enough to prevent that.
+        * Make sure try_to_free_swap or reuse_swap_page or swapoff did not
+        * release the swapcache from under us.  The page pin, and pte_same
+        * test below, are not enough to exclude that.  Even if it is still
+        * swapcache, we need to check that the page's swap has not changed.
         */
-       if (unlikely(!PageSwapCache(page)))
+       if (unlikely(!PageSwapCache(page) || page_private(page) != entry.val))
                goto out_page;
 
        if (ksm_might_need_to_copy(page, vma, address)) {